prove by using pmi 1.3+2.32+3.33+...+n.3n= (2n-1)3n+1 + 3 / 4 Share with your friends Share 0 Abhishek Kr. Jha answered this Please follow the link:https://www.meritnation.com/ask-answer/question/1-3-2-32-3-33-n-3n-2n-1-3n-1-3-4/principle-of-mathematical-induction/5215197 0 View Full Answer